Php/docs/reflectionfunctionabstract.getreturntype
ReflectionFunctionAbstract::getReturnType
(PHP 7)
ReflectionFunctionAbstract::getReturnType — Gets the specified return type of a function
说明
public ReflectionFunctionAbstract::getReturnType ( ) : ReflectionType
Gets the specified return type of a reflected function.
参数
此函数没有参数。
范例
Example #1 ReflectionFunctionAbstract::getReturnType() example
<?phpfunction to_int($param) : int { return (int) $param;}$reflection1 = new ReflectionFunction('to_int');echo $reflection1->getReturnType();
以上例程会输出:
int
Example #2 Usage on built-in functions
<?php$reflection2 = new ReflectionFunction('array_merge');var_dump($reflection2->getReturnType());
以上例程会输出:
null
This is because many internal functions do not have types specified for their parameters or return values. It is therefore best to avoid using this method on built-in functions.
参见
- ReflectionFunctionAbstract::hasReturnType() - Checks if the function has a specified return type
- ReflectionType::__toString() - To string